The rand/dollar exchange rate was R7,5= $1 in May 2011. Determine the dollar that you will get for R1

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart